Mercur is a historical hard rock mining ghost town located at in Tooele County, Utah, USA. Its elevation from sea level is approximately 2,042m. The nearby Mercur Gold Mine was opened by Barrick Gold in 1985, and is still in production.
In 1879, a Bavarian miner named Arie Pinedo had discovered a deposit of cinnabar in the area. The ore contained gold as well as mercury, but contemporary processes were unable to extract it. Similar discoveries were made throughout the 1880s. In 1890 the advent of the cyanide process started the gold rush all over again. Gold was extracted not only from newly-mined ore, but from old tailings as well. Soon there were enough people to build a new town on the old site, but the name of Lewiston was already taken by then. The citizens settled on the name Mercur, from Pinedo's claim.
Amongst the miners were many members of The Church of Jesus Christ of Latter-day Saints. There was however no organization of the church in Mercur until 1896 when a branch was organized with Charles B. Felt as president. In 1899 Moses W. Reynolds, James Duckworth and Sidney S. Reynolds were sent to the town as missionaries. Their success in both bringing church members out and possibly having some convert baptisms led to the organization of a ward in Mercur on July 1 1900 with George W. Bryan as bishop.
In 1902 a fire that started in the business district of the town burned almost the entire city to the ground. The town was rebuilt and mining again resumed. In its heyday there were about 5,000 residents of Mercur. This would indicate that probably less than 20% were Mormons, and active Mormons numbered even fewer.
The ward was discontinued in 1913 because the mines had closed by then and pretty much the whole population had moved away.
By 1916 there was only one building left in Mercur, and by 1930 even that was gone.
The currently-producing Mercur Gold Mine went into production in 1985, and is operated by Barrick Mercur Gold Mines Foundation, a wholly-owned subsidiary of Barrick Gold. Annual production is about $US 20 million, and the company has about 200 employees at Mercur .
Mercur is known for producing fine specimens of Lorandite, TlAsS2 .